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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c696a767e26c96efe08beb04847a45b8f87ab9fd95f93701c93988d116ff15' 
  AND token = 'x2QEOmLk1Fjr/+9UbQPzTdU17UezWWTenpMTEGC5hxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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