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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bf46d9ae2a1de94196fe8db923f07afaf48b0752ae01f1faa95573dc683b74' 
  AND token = 'eCFUJB4R4rMimzndOS8wFt4MEvMFu3egidjFjC5C4yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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