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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211e7e11465d0d0e3ea86d2ee934e11d42810af854558d6c9993071f948a6865' 
  AND token = 'HV8x4+lHsCsXhLGbAQ2g4sU4svXrU+cs8d+H5QhWDMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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