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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4b9e9e37bcc354d5b389650fdd3b90b9cd02f631506eb31a9411c87e1acc54' 
  AND token = 'jbCJZ6iEAA6mp9mqKXFzumnr8d72PoHS1nyPaBr2rmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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