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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696c6b8591f9e836be2814460dd78ad3b093c4d8f0c21342039bb9793944f0c1' 
  AND token = '3t6uqkPIVK9/J5ZDQF0axVMwvWGsNDPbEWm3wpv09Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}