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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e3d6c27c9196a069e83d27a4249e0b20822507ce83d117691d6c5570e3994a' 
  AND token = 'xtm1QBrZzf02/aeehNJjPeKSCCxi5unnnjC+E8d6eHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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