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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51e90fc101657c88137d0c108e7bb526e8179802ac04184365aadc968f15fa3' 
  AND token = 'bZwr97+N6mjNR4J9lU4P8WqrTMOFDQAIVNx4ZPXtdTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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