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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f520454473cdc1b2b0b085b8f18ec21259c7265f32653744eaf9268b5eebad15' 
  AND token = 'WYDOfOqL2jK8RML8wHhAoLSpMN/ttHpAH9eF+tsotYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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