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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0bc893c6c461e6067e1cfaab5367000407ae546bb2444d410f4e0fa975196f' 
  AND token = 'wVGJgel10GlUG4r02TTS0bSKbVrgtirNQpqv9O1qLNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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