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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f90081f9692a96a4a4945e575352ffacc01e826c758527cdd385fd0167d7e1' 
  AND token = 'a0EX66y19/NzYBniWRQTwET8KVhiHWCw4h1Xll03+mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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