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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a006d4f2f9abb006d96b3fd44cd5fcdb28335d3bd711e3936c9af225d2c38cb' 
  AND token = 'O6oMBeZj0Ewm0Uh8+XeN9nFm764ZOd3EqC4+Q3AUII8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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