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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec13cdccc0ae38bf0e14cc5a410ba4b26ae1917b52cbca4a8a1748b0defe993d' 
  AND token = 'p7RJPh908eQ2jWqlIovaNK9U9b7ULLAIFKJR4Fvy+HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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