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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce4c658f8fa39f35541e07afcdf9e0bf395a6d6c4c4e8275fd349bcf053d62a' 
  AND token = 'jBWuCZoTKSUEYC6mpDmgB7ZRptcaC6ohdVC+Yj1de2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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