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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5634b3512a9e0af77f08929f480d240edd22677281269a33ac6fdb803c0050' 
  AND token = '0j9VSw6JgAhI+SEqHasAMy+Jgk7sgGQmy8gGH7vDAcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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