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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a02803c0a0fb55dfdc5c03e9cbcedeedb5773214ccbd38bd71091aa3d2c1f0c' 
  AND token = '2DYSgvn2eln5qizE3ZB6wGCw/iJTwFexV1Ed1jHckxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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