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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bca7cd2d4d61afa3563d903592050d5515497c1887e649aa4ec22cfe57f5f98' 
  AND token = 'lbX54F0NK4zm2vVIIwUCUaiO24S1/8N/4r0/6a4+2X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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