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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5966b2717445677ca2bb2d12cb1e8c8da6b87a652aae4cea7ac2bc25f15812' 
  AND token = 'kqp5bNSq8jU1rNYKyYUdyN/mBc5qQLRXBVPePS/55AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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