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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bded3dcc1c84530b3e5738768ddfd2edbc11c6075de5d2a83cad69bf7207b90' 
  AND token = 'mptnlD1fJX8JfTNAMR5YGRQLW4fsHQBXIx1YGAVMghs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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