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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e14994d2b90d57106dfe31c44539379641da1914f94248a212b53f4c268bef1' 
  AND token = '76MU1kzF+HhKekDQrk2m8IQ0RIpLLgFdrezTpPlc4mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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