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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d34870855de36bfa7e3941b4854c879a5747c6b1f4324e6e7ac2eab9b31b1d' 
  AND token = 'WbDyMZ0FGU5wqVlE12PfjpGRrYaN0N28iukLAiBS8b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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