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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bae503511bb5f20e1af3d8f0789d1212d9c274c772c93a7273da77822167bd' 
  AND token = 'JdOo3Sk85zAVDADu9GctYLl4AtJPbiggPNOlfU+jitY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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