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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d85b3087a75ca1d78ad7060076e3c7d90cd01cddfbd53726fa09613345df82' 
  AND token = '37wvx2RI316swxApTqsmOR4pn7syc0wxJEraNDhFZ8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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