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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6701ed800730201e49fa7a9ff89f7920c0a4e4b9d2e827cc9e8bb75133c7ff3a' 
  AND token = 'CjUnDsRQD6VuuUlulpIQ/LbORr/YeVz3/cH6XAAjQOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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