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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60fdd4aedab354d29aeb107e4ae5894bbf879d66c3257379cf10cc36b07d6e5' 
  AND token = 'Lgows4fmfz1o5ex4RUHC6T9/sU3SxxtSourkDTS7s0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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