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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91ca885cefb6329e556a1e51713fbd4de1e6636cb2f5f4e054cf8a54a82557d' 
  AND token = '7aqAeiz9R8tTGr1zss8G34gVh3iIMna3rFuigwGEKR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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