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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4a1548c4ef19445e60f24a0a986930e88f322f2f573034409b492084980d27' 
  AND token = 'G/T3EAN68qKh5dcxS+gFEoYJ/3SRSXs+RJK1f5eWSSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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