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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ee570eff97846131409dfaf906c3fb157b1908f14ceb5372ea1aeb9487f7fc' 
  AND token = '/5LDmjilp210UUvniN7g3D2YLXDI1GqUwaK3VjqA3ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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