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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd07a47fef6c7daed4fa13db7d2a2becf1df797bba22e6710c05339d8458e8be' 
  AND token = 'xm2siG8amXHJYU7iw/BJAwfXOQJP1mb2ch2Aw9K6aHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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