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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc3f6a930e7eef6732fc0e12f1cfd6b410d20ea21dc1f6d31875a16b53ff115' 
  AND token = 'z55t4tzdHKBSSXUaT1d/T6XCR8QSfbdX+iNuD6XY1wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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