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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734adcf73005f6e5756186d74cc11d2d966e6d3ecdb43a472d23d8f29436e831' 
  AND token = 'n2tS1vjK+mXzShhPPFDDlp9ecIr0krmJ+cXj+1cg4is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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