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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df1c0b3700f6473f6a1f5ac78b39010b77fd1a5ce0e8be1107fec7bbebbd45b' 
  AND token = 'nyt9ijBdZiNcMgz09tW2Slcp6uYF4ANqE1qZG4ahMcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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