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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec997e199315d2b5564e57483e600f8e495eac970b7c6a3d4445904c822b452' 
  AND token = 'X7P6TdpOvdcPEjKgNmw8nlNMFA7f7zl2DOGrjdq92VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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