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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7609696a48520d27a1aa3d49a9e90c38676e5e26607aea547fb9df554b43174f' 
  AND token = 'f2l+yUxCgEdNacJ3/+Zg1rgIdiDPIPLkpguv1WH4M+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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