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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5674ac36d4d9ee33e36ad80f59dc9bf22b657bd41b606366228dfc8d1a4873' 
  AND token = 'DPiR/N/3oY+JFS2+YWwU/RguxbAyiENs1+FMHwTX5wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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