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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b953295fd307aab3fce7fb474f9a1b2e0669cf52e64baed6e4ea7c26118457' 
  AND token = 'dxeTW9EiguxBjXNCelN0FBORKpRoq3vfZ3RF+/Dn10g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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