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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5c68bc93823683c6d3136bad4ab1e58cfefdfa2e3c2b8ff5fec10c74d07ba9' 
  AND token = 'nwAZNqXoqJpMyMU4gmFCG1hypd6eH7wDW6i4VD9vx90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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