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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416679e8bf2d143d8aea9c81bc27aced51dc215badd866758c889ca9a5fc184a' 
  AND token = 'IK+3GrbE4WKbVey14C5/L/pZKB5/ABEMD3ei66mwEPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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