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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7add72cda9b63ddea4424102ed06fed24f894d3f0f998ae5b5e1b9f8287a9735' 
  AND token = 'bQOYQ3ylVWVpE4nhUrwA+mJSSe6+MVkd5hPG5l95mZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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