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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03db8f616e4d544ce6a0e9c6dec653edcb8955befe3f9f02bb4425ff3903616' 
  AND token = 'qb08Op2scPqMoWixp8VdKU4vE3T6ifr+7qq4k9fHuPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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