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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6256eb8f65ad0580580411c29e888b1fdaccea1ef584a01b75eb67ff50ea6955' 
  AND token = '7iq6ze6ksEsZyHupjxF1wN0va2bzOsav8FUHALVom0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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