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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e632e9d82c4c54cb7d28e8a5e08fad352d5f0b4edda65d3e24ddaed8534e7a68' 
  AND token = 'kB2GoHAHdgkVRev/Vii+JfFCJJrzrdbj+z1+v+NHeWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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