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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0df3a061a7cd6f8ee78f64898477edc858a1c1d998914bf864b7183e45b556' 
  AND token = 'VcAYVZD/GsmFDW6SVLpJvccDA/dfjsLIUtuVQSBk1a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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