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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca8a83cbff6ea18c0e2367f87931f9a64487770319b68055f5c26f9026c7d76' 
  AND token = 'CljG7IC7+6fi+9kE9ijNTmyugl2Po4LWDVC3hrmBhuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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