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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b08181ddd4e21f1c6521fee9bb7669f36483df38ebc54a134961d3951f2f26b' 
  AND token = '9gX28b2UYila+Adv7XrQLwx4WD2dWMOdynIA6aahC44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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