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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6a522deb38520c31b6e39ff1027c823a490945d5365ab290faf2f18c2f9e95' 
  AND token = 'nEsnOmM7cRatD5Lhzf2fuZjLK0puRSiuja/YazmIL/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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