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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce55b252a93e0accda3f12861e178b641df6bd7a1996771e663e3457be9e893' 
  AND token = '/89APJwBWGlr4cCpPRzLgvsS/JCC6O5tWTW7IHug414=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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