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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c3b495b6e7cb177ca0d559bde03d4371bb25aceed8788991b65ff2b683e171' 
  AND token = 'e8zrQqv2RcPaMfVoeUuboI4/Nm3Xm4OGrCO63mn24Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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