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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c94f5ae68b9a6c9ef8a893eb34b794e99ab040a22a033f5ac0649270ef88886' 
  AND token = 'n6jhfNKyyRwz3pRch1phgxlVPYbjzSsN/b69WfyAzUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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