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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f8b4e00b4c4c2049ac630392de19a5318fdbe841face1e09a8dc60e608857c' 
  AND token = 'xlfmYpSm7IY2SbZtxCkMtMXoNEVrT7fEGu4k1lHzplY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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