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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c895ee6fbb00b9ecc4bb0451d1ff95944a5467c5b5f6e8da88691803718b9262' 
  AND token = '6JsLJH0dEGNaJKjnTic4vN+jojXp/lCD2ZthfL3ZcR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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