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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dde362682b60e74c4657c61e67e0bafdfd4b3bd95b1393e582c4bbc992c6205' 
  AND token = 'NLbMEkK3beP0Tma1UUzI0s6ElnV/OLE3GrFhqwg9m/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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