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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb82e5e700fa20b25b2e1e8256d80eee57dbd44fff8371c18db9a43e08e3996b' 
  AND token = 'ZzLUG4RD9ivimfczelNXkS+19n+11WPS7awh+CcHdP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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