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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc088938ad157831688b9c65f32d60486633bb3bd8f6d4b60884ccc20d8165a8' 
  AND token = 'LsnGH3yLMHoPictQqYNh6oCVSy0uVbT2npR/ultZqV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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