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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a646b68e80c8ba4c2e6910f810970cadfa08539029594926519c0832cd9f0f83' 
  AND token = 'AlVg3M/aqN27ayrSTqq9mr4zvx0adFasHzfAakiEmdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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