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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810afd9649d6f9064ac9758c7d718f8fbc1a2415aae331a328444e814a4e6141' 
  AND token = 'gF0q1E+W1zKPU+901i2S9iJjTFvet2d9QOQFn3GYWgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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