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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd05b67ad53c0ac25a0e7ae8c8f87246d7a1792768c7624f6920c7a44999eb4' 
  AND token = 'oWqpNpbr12NHrBXGx4QMX9pKM9OmDwIdfxQyQkPBFBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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