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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608f0e404bc340126dc0bed741dde4d7cacf9423e524ed80b4233deb89ac1a10' 
  AND token = 'YGaYWx8ukjmiFS+f3jYse63k7+mpbsEoR7DfPZ3Ym1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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