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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13015e9b0590bc9e8060eebab16766087e95a1a4ef631daf3658147c6e0d5d3' 
  AND token = 'KWoF5qhFXnO6CHwXhEmwibMC9M6VP/qRiqfd5lzuggQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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