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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f90757942010773737a22bc8569528190590ab200e0460cc79cc75e978924d' 
  AND token = 'IBx61IPNQW2/YrO/LuklG21WmFa3oo2OLVIS1f+4IAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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